Packing-joint for heaters



(No Model.)

R. J. SGHWAB. PACKING JOINT FOR HEATERS.

No. 585,706. Patented July 6, 1897.

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PATENT .PACKING-JOINT FOR HEATERS.

SPECIFICATION forming part of Letters Patent No. 585,706, dated July 6, 1897. Application filed September 3, 1895. $erial No. 561,201. (No model.)

clare that the following is a full, clear, and

. exact description of the invention, which will enable others skilled in the art to which it pertains to make and use the same, reference beinghad to the accompanying drawings, and to the letters of reference marked thereon,which form a part of this specification.

The main object of my invention is to insure gas-tight joints in the construction of stoves, furnaces, and other heating appliances.

It consists in a novel construction and arrangement of parts forming a packing-joint, as hereinafter particularly described, and pointed out in the claims.

In the accompanying drawings like letters designate the same parts in the several figures.

Figure 1 is a vertical medial section of a furnace-dome and surrounding drum or radiator. larged scale, of the packing-joint by which the sections of the dome and drum are united with each other; and Fig. 3 is a like view of a modification thereof.

For the purpose of illustration I have shown and will describe my improved packing-joint as applied to the construction of a furnace, although it is equally applicable to the construction of other kinds of heaters.

Referring to the drawings, A designates the dome of a furnace, and B an annular heatin g drum or radiator encircling it. The dome is composed of cast-iron top and bottom sections 0b a, which are formed with annular packing grooves or recesseso a, having contracted slots or openings formed by inwardlyprojecting lips or ledges a a as shown most clearly in Fig. 2, for the reception of the rims or edges of the side section or cylindrical portion a which is preferably made of sheet iron or steel. The top and bottom sections are cast at intervals with perforated ears a a to which the sheet-metal section a is bolted or riveted a short distance from the packingrecesses. These recesses are filled at the Fig. 2 is a sectional detail, on an enends and on both sides of the side section inserted therein with asbestos cement or other suitable packing material, which is securely held therein by the contracted walls of said recesses on opposite sides of the slots or openings through which the side section passes. The bolt or rivet connections with the ears a a prevent the side section from working endwise in the packing-recesses and its edges or rims from becoming loose in the packing. By abruptly contracting the walls of said recesses to form the lips or ledges a a with a narrow slot or opening between them of just about sufficient width to receive the edges of the adjoining section the packing material is prevented from Working out of said recesses, especially when their openings or slots are presented downwardly.

The drum B is similarly constructed of cast top and bottom sections 1) b and sheetmetal side sections Z) Z), connected with each other by joints like those just described.

I do not Wish to be understood as limiting myself to the exact form of recess shown for the packing-joint as hereinbefore described, as it may be varied in shape without materially affecting the results secured by its use. Any form of recess having a contracted aperture for the reception of the adjoining sec tion is contemplated within the scope of my invention. In Fig. 3 I have shown one of many modifications which maybe made in the form of the recess. When, however, the packing groove or recess is formed in a top plate with its opening presented downward, I prefer to construct it, as shown in Fig. 2, with its Walls converging downwardly toward the inturned lips or ledges a a In this way if the cement or packing becomes contracted or loose it will tend to settle and wedge itself between the opposing faces of the packinggroove and sheet-metal section and thereby maintain close tight joints between the sections.

My improved joint is specially adapted to and designed for uniting cast and wrought metal, such as cast-iron and sheet iron or steel, of which the coefficients of expansion are different. This difference in expansion between cast and wrought iron or steel, which are extensively employed together in the construction of heaters of various kinds, 1s a source of great perpleXity to manufacturers and annoyance to users, as it causes carefully made and packed joints to become loose and to permit the escape of gas.

It will be observed that in the construction of my improved packing-joint the sides or walls of the grooves are cast integrally with each other and have no joints which can become loose and leaky; that the grooves are made quite deep and larger and wider at the bottom than at the surface where they open for the reception of the tongues or edges of the sheet or wrought metal sections, which project quite a distance into said groove; that packing is held in said grooves on both sides of the sheet-metal sections, completely enveloping their edges and closing the contracted openings or crevices between the side walls of the grooves and the faces of the intervening sheet-metal sections, and that the sections are securelyfastened together at intervals close to the packing-grooves.

I claim- 1. A packing-j oiut for heaters, consisting of a packing-recess formed in one section with integral walls and opposing inturned lips or ledges forming a contracted slot or opening between them for the reception of the edge of an adjoining section, and suitable packing held in said recess on both sides of the insorted section by the inturned lips or ledges of the other section, substantially as and for the purposes set forth.

2. A packing-joint for heaters consisting of a packing groove or recess formed in one section with integral walls converging downwardly toward inturned lips or ledges forming a downwardly-opening contracted slot for the reception of the edge of an adjoining section, and suitable packing held 'in said recess on both sides of the inserted section by the inturned lips or ledges of the other section, substantially as and for the purposesset forth.

3. The combination of two heater-sections, one having cast therein a packing groove or recess with integral Walls and inturned lips or flanges forming a contracted slot or opening to receive a rim or edge of the adjoining section whichis made of sheet metal, suitable packing held in said groove or recess on both sides of the inserted section by the inturned lips or ledges of the other section, and fastenings for securing said sections together wholly outside of said packing-recess, substantially as and for the purposes set forth.

4. The combination of two heater-sections, one being cast with ears and a packing-recess, having a contracted opening to receive the rim or edge of the other section which is embedded in packing held in said recess on both sides thereof and is bolted or riveted to said ears, the walls of said recess being cast or formed integrally with each other, substantially as and for the purposes set forth.

5. A packing-joint for heaters consisting of a groove formed integrally in one section with a contracted slot or opening through which the rim or edge of the adjoining section proj sets into said groove, the walls of said groove divergingfrom both sides of said slot or opening and forming a recess on both sides of the inserted section for receiving and holding suitable packing, substantially as and for the purposes set forth.

In testimony that I claim the foregoing as my own I aflix my signature in presence of two witnesses.

RUDOLPH J. SCI'IWAB.

Witnesses: GHAs. L. Goss,

MARY SCHEFTNER. 

